Income Taxes - Earnings Before Income Taxes and Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings before income taxes:
United States	$ 1,007,847	$ 743,687	$ 697,501
Foreign	208,615	163,749	125,936
Operating income	1,216,462	907,436	823,437
Income tax expense:
Partnership UBT	6,951	3,356	9,196
Corporate subsidiaries:
Federal	750	1,495	(943)
State and local	956	904	975
Foreign	58,080	44,086	32,290
Current tax expense	66,737	49,841	41,518
Deferred tax	(4,009)	(4,188)	236
Income tax expense	$ 62,728	$ 45,653	$ 41,754